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    <tr> 
      <td align="right" valign="baseline">Last Name :</td>
...
      <tmpl_if err_last_name><br><font color="#FF0000"><strong>Please 
+input your last name</strong></font></tmpl_if>
      </td>
    </tr>

use Data::FormValidator;
  
...
  foreach my $f ( $results->missing ) {
        $output = $f. " is missing\n<br>";
  }